An alpha particle is made up of
a. two protons and two electrons
b. two electrons only
c. two protons and two neutrons

What is the name of this hydrocarbon?

What does x represent in the formula for the compound xcl4?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.